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Dec 6, 2012 3:00pm PST
on these widely dispersed cases, the cdc is turning to technology. one of the ways that we've been doing that is similar to what the fbi does in terms to having a national database of fingerprints of criminals. anytime one of those bugs is isolated, either from a human stool sample or from a food product, what happens is it goes into a network of laboratories that are capable of performing the fingerprints, using standardized methodology. changes in how food is grown and handled, increased international travel, people crammed togethe in uanitary nditions-- all contribute to the emergence of these new and deadlier microbes, but there is another critical factor. david bennett: we now have the threat that our major tools, the antibiotics that we can treat bacterial infections, are being compromised. there's a lot of resistance to antibiotics, both in hospitals and communities, so we're very worried about what will happen there. and this means increased cost, and it also means in some cases we can't effectively treat some infections, or it's much more difficult to treat. stephen ostroff: so
Dec 6, 2012 11:00am PST
. brazil has received some help from some new technology and from other ecologists, including chris uhl. uhl is the founder of imazon, a research institute located in the city of belém. the law in pará state says that 50% of all prate land must be maintained in forest. until recently, that was very hd to monitor. now, using a system of satellites casearcher carlos sousaiing cadot, okgps is realowhat it allows us to do is to pickp signals from the satellites. and through ocess of triangulation we can locate ouels rylynr and through ocess to within about ten meters. four... ey've gour sateites now. we are... probably... in this... area. mm-hmm. narrator: if the government chooses, it can use gps to locate property lines on satlite photographs of the landscape. they can then determine how much of a farmer's land has beenleared but enforcement is stty. anotg problem is thenefficient way the cleared land is being used. the most common farming and grazing method here requires the farmer to cut tousandofirm spe,t it set by farmers during the dry season to release the nutrient
Dec 7, 2012 3:00pm PST
: so for copan's metateros, the market potential was limited by technology. because they had to carry the stones to market on their backs, the market had to be close by. filomeno's problem is similar. although he can use a bus to get his metates to market, the cost of transportation must be added to the sale price. if filomeno transports his metates much beyond the neighboring market town, he must add the cost of a round-trip bus fare to the price. and this would make his metates too expensive. ten miles from filomeno's house is the town of tlacolula. market is held here once a week. almost everything is sold by the actual producers or their families. weekly markets are one of the most ancient of economic institutions. today, sales involve cash. but until quite recently, most societies, like the ancient maya, depended on barter, so much of one commodity for so much of another. market at tlacolula is highly competitive. there's a large number of sellers for each product all in competition with each other, and all within sight of each other. and the buyers, also people from the countrys
Dec 6, 2012 8:00am PST
on now. the physics-types and the technology-types are working on. but when--and if and when they're solved, things are gonna be like different. really different. questions? i didn't quite catch the deal on breeder reactors because, say, losing mass is the name of the game. redirectors make it. let's go to that very, very quickly. what a breeder reactor does is very simple. if in your reactor you have 238 of plutonium-- or 235 of plutonium causing the fusion, if you put in some u-238-- i erased it over here-- the 238 will be turned to plutonium. so you're really not gaining any mass. what you're doing is you're converting something that's not very helpful, 238. you're converting that to something that is very helpful, energy-wise, plutonium. and the analogy i used in the book is like putting gasoline-- putting some water in your gasoline in your car. so it isn't like you get more mass than you started with. you're just converting the water to the gasoline. or in this case, you're converting the 238 to plutonium. and it turns out, every reactor is all the time breeding. if you have
Search Results 0 to 3 of about 4